Manufacturer: Baader
Product number: BA2956800

EUR 190,00


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rating: 5.0 of 5
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The RCC 1 (David Rowe Coma Corrector) is a new corrector for Newtonian telescopes with notably long working distance. Standard coma correctors only offer 55 mm from their T2 threads - just and only enough for a T2 ring and a SLR camera.

The RCC 1 offers, due to its triplet lens design, 91.5 mm from its T2 thread or even 94.5 mm from the M48 thread. The knurled ring can be taken off and the corrector therefore be countersunk in a 2" focuser.

The optical performance of the RCC is very similar to a Wynne coma corrector. The corrector also works with very fast Newtonians and gives a good illumination.



Use with a DSLR and TSOAG27 Off Axis Guider:

You need:
RCC1 coma corrector: 94.5 mm space from the M48 Thread
M48Abstimmring2 - 1.5 mm thickness
TSVF205 - 5 mm thickness
TSOAG27 - Off-Axis-Guider - 33 mm thickness
Than you have exactly 55 mm distance from the T2 thread of the off-axis guider to the sensor.



Not each Newtonian telescope can work with the RCC 1:

The RCC 1 has a long working distance - more than 90 mm. So you can use DSLR camera, off-axis guider and much more. But this only makes sense, if your Newtonian also offers enough backfocus.

So if you use a DSLR camera with T2 ring (55 mm) and an off-aAxis guider with 30 mm, but your Newtonian only has a backfocus 70 mm from the 2" connection, it is very simple to see that the system will not work - you will not reach the focus.
Telescope side connection:2" with M48 filter thread
Camera side connection:T2 and M48 thread
Working distance:91.5 mm from T2 and 94.5 mm from M48 thread
Length:73 mm - can be countersunk in 2" focusers
Diameter:50.8 mm / 2"
Lens:Triplet Lens Design
RCC 1 Coma Corrector
Dust Caps







User report to the Rowe coma corrector RCC1 - by Detlef Hartmann

It works very well, the focal point is only laid 5mm outside.

The focal length of the telescope is extended by 2.6%. Visually, the stars are tack-sharp, even at high magnification (400x). In the edge of the ST-10 field (9mm off-axis) the star are pinpoints although my telescope has not matched the ideal corrector conditions (f/4.5 instead of f/4, back focus 96.6 instead of 91.5mm).

I have compared the star´s diameters in the middle and in the edges of the field - no degration is visible. Center FWHM is 2.59" and 2.5" in the edges. Even the sensor´s sesivity in the infra red (950nm) does not lead to unsharp stars.

Without the coma corrector, the image quality is significantly degraded in the edges (picture 1). A little bit problematic is the vignetting: 9mm off-axis there is a light loss of 12%. But this can be easily corrected with flat fields; additionally, the effect of vignetting will be less if the correct distance between RCC1 and sensor plane is kept.

Both unprocessed photos show the field edge 9mm off axis at 300%. You can see at the hot pixel´s position that the same sensor position has been exposed both times. Due to weather conditions, both images do not show the same object but nevertheless a gread quality improvement is obvious.

Picture 1 - Star image @ f/4.5 without coma corrector, 9mm off-axis.

Stars without coma corrector @ f/4.5 - 9mm off-axis

Picture 2 - Star image @ f/4.5 with Baader RCC1 coma corrector, 9mm off-axis.

Star @ f/4.5, 9mm off-axis, with Baader RCC1


Question:
How do you have to measure the working distance?

Answer from Teleskop-Service:
The working distance is measured from the beginning of the connection thread on the housing of the corrector (see example picture):




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Reviews

Written by Martin Haslehner
on 2022-12-01

*****

Written by Georg Nyman
on 2022-07-21

"Ein toller Korrektor - sehr solid gebaut, dafür 5 Sterne. Die optische Qualität in Verbindung mit meinem Refraktor kann ich erst nach Testaufnahmen beurteilen"

Written by Antoniel Silva
on 2015-12-02

großartig